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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Published on: March 20, 2017

Data-aided adaptive weighted channel equalizer for coherent optical OFDM.

Mohammad E Mousa-Pasandi1, David V Plant

  • 1Photonic Systems Group, Department of Electrical and Computer Engineering, McGill University, Montreal, QC, H3A-2A7, Canada. me.mousapasandi@mail.mcgill.ca

Optics Express
|April 15, 2010
PubMed
Summary

An adaptive weighted channel equalizer (AWCE) improves long-haul optical transmission by tracking channel drifts and reducing overhead. This technology enhances phase noise compensation for better system performance.

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Quasi-light Storage for Optical Data Packets
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Quasi-light Storage for Optical Data Packets
07:45

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Published on: February 6, 2014

Area of Science:

  • Optical communications
  • Signal processing

Background:

  • Long-haul coherent optical systems face challenges from channel impairments like polarization mode dispersion (PMD).
  • Existing equalization methods may not sufficiently adapt to dynamic channel drifts.
  • Accurate phase noise estimation is critical for system performance.

Purpose of the Study:

  • To introduce and evaluate an adaptive weighted channel equalizer (AWCE) for coherent optical OFDM (CO-OFDM) systems.
  • To assess AWCE's effectiveness in mitigating PMD and reducing system overhead.
  • To investigate AWCE's impact on phase noise compensation (PNC).

Main Methods:

  • Developed an adaptive weighted channel equalizer (AWCE) operating on a symbol-by-symbol basis.
  • Simulated AWCE performance in long-haul CO-OFDM transmission systems.
  • Incorporated data-aided phase noise estimation using RF-pilot signals.

Main Results:

  • AWCE effectively tracks slight drifts in the optical channel, combating PMD degradation.
  • Increased pilot symbol periodicity led to significant overhead reduction.
  • Enhanced precision in RF-pilot enabled phase noise estimation was achieved, even in noisy conditions.
  • Improved quality of phase noise compensation (PNC) was demonstrated.

Conclusions:

  • AWCE offers a robust solution for adaptive equalization in CO-OFDM systems.
  • The proposed equalizer effectively reduces overhead and enhances phase noise compensation.
  • AWCE is a promising technology for improving the performance and efficiency of long-haul optical communication systems.